I have a table with a column `the_geom` which contains data similar to:

```
0103000020E61000000100000005000000CE473AACFA071E40F27FB23340744740336FE841C6231E40873BED903F744740FC150A0ACE231E40D19E2684637647409C9B443D00081E409A9AF82664764740CE473AACFA071E40F27FB23340744740

```

Which when applying the function `ST_AsEWKT(the_geom)` returns:

```
SRID=4326;POLYGON((7.5077921782085 46.9082092877942,7.53493597966353 46.9081898840296,7.53496566473541 46.9249119938446,7.50781341296434 46.9249314035307,7.5077921782085 46.9082092877942))

```

I need to select all data that is within a 30km radius of a specific lat/long point, for example: 

* lat = 46.8167
* lng = 6.9333

However whenever I tried to use `ST_Distance()`, I always received values less than 1, and using `ST_DWithin()` always returned true.