Sure, here's an example of how to create a JWT token in Go using the Golang-JWT package:

```go
import (
    "time"

    "github.com/golang-jwt/jwt/v4"
)

func createToken() (string, error) {
    // Define the header and claims for the token
    header := jwt.NewHeader(jwt.SigningMethodHS256)
    claims := jwt.StandardClaims{
        ExpiresAt: time.Now().Add(time.Hour * 24).Unix(),
        IssuedAt:  time.Now().Unix(),
        Subject:   "user_id",
    }

    // Create the token
    token := jwt.NewWithClaims(header, claims)

    // Sign the token using a secret key
    secret := []byte("my_secret_key")
    signedToken, err := token.SignedString(secret)
    if err != nil {
        return "", err
    }

    return signedToken, nil
}
```

In this example, we first import the necessary packages. We then define the header and claims for the token. The header specifies the signing method to use, in this case HMAC with SHA-256. The claims contain information about the token, such as the expiration time, issue time, and subject (which can be any identifier, such as a user ID).

Next, we create a new token with the specified header and claims. We then sign the token using a secret key (in this example, "my_secret_key") using the SignedString() method. Finally, we return the signed token.

Note that you should replace the secret key in this example with a secure randomly-generated key, and take appropriate measures to protect it (such as storing it in a secure location and not sharing it).
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