Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79388eae0f440f787c714e63b677689f8bf70737e4d4b4a9cde726160f4add1c' 
  AND token = 'S8eXRU6DFjmYP8Uizi7WsL63naKQnJUI5+sAN+LNNlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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