title: laravel show users where last_seen <= 2 minutes
body: <p>how can show users where last_seen column time &lt;= 2 minutes with now()</p>
  <p>i write this code but code cant calculate time</p>
  <p>tip : last_seen column type is TimeStamp</p>
  <pre><code>$expiresAt = Carbon::parse(now())-&gt;addMinutes(2)-&gt;toTimeString();
      $users = User::where('is_admin', '!=', 'superAdmin')-&gt;whereNotNull('last_seen')-&gt;whereTime('last_seen', '&lt;=', $expiresAt)-&gt;orderBy('last_seen', 'DESC')-&gt;get();
  </code></pre>