Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa84f79554a8ad90a9f72a45332a17d33004f3277fc8d7d2ecc1fa2a98d0594d' 
  AND token = 'D0O0PIXqOIqOCE9siGIcLdqlGS4ZSJpCecqnB8sIhTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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