For CakePHP 3 (in case someone's searching), you'd need to use the SQL functions:
$query = $this->Example->query();
$query
->insert(['created','id'])
->values(array(
'created' => $query->func()->now(),
'id' => $id,
));
$result = $query->execute();
Sources:
- query-builder.html#using-sql-functions