Set a date field equal to "current time" + "5 minutes" using tokens
I can't think of a solution with just tokens. Here is a quick and dirty solution without tokens

Setup your Article datetime field so that has a default relative time of +5 minutes



You can hide this field with css so the user will not change it or you can do it in a hook_form_alter function in your MODULENAME.module file

// adjust node_article_form for your content type 
if($form_id == 'node_article_form'  || $form_id == "node_article_edit_form"){
  $form["field_article_datetime"]['widget'][0]['value']['#attributes']['readonly'] = 'readonly';
}


Of course if a user takes much time to fill the form the set datetime might not reflect exactly the NODE CREATION TIME +5 minutes (as a datetime is set on form creation time) 

If the above is not good enough you can probably use hook_entity_presave to adjust the time to be EXACTLY the creation time +5 minutes.

function MODULENAME_entity_presave(Drupal\Core\Entity\EntityInterface $entity) {
  // adjust article to reflect your content type
  if ($entity-&gt;bundle() == "article" &amp;&amp; $entity-&gt;isNew()) {
    $created = $entity-&gt;created-&gt;value;
    date_default_timezone_set('GMT');
    $createdadd5 = date('Y-m-d\TH:i:s', $created + 5 * 60);
    $entity-&gt;field_article_datetime-&gt;value = $createdadd5;
  }
}


NOTE: if you want to update the timer even on node update you can just delete the &amp;&amp; $entity-&gt;isNew() part.