Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdf9c8692238c352de135cd8b4151a4aae27500d23f5f19bde98d9499af9dfc' 
  AND token = '51o2vI4xmmcKNeTQSBBnLLx10necJ1fEv9DrUsFFkaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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