title: How can I remove rows where their timestamp older than now?
body: <p>Basically, I fill a row with a timestamp => '1558180800' for exemple.
  I want to remove all rows which their timestamp is greater than now, current timestamp.</p>
  
  <p>I tried several things but didn't work :/</p>
  
  <p>One example of the query I've tried:</p>
  
  <pre><code>DELETE FROM roompasswords WHERE timestamp &gt; NOW()
  </code></pre>