Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70496d3bdd4b2588dc308cbbe296f411ee26dcd870a1f1e30686d9954d3480c8' 
  AND token = 'Iw8JCQxKrjt7qKDiN+4neVMQkM5r9yEwFGxPuSyVrFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}