Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ff41f9b75d0cece5671593718e370d1f11e609732a5be7b6d2136fe67a4571' 
  AND token = 'to3K+hWILcp7JcrLzQQ+cZ9c0OgpVcVz8VJCwbzmH6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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