SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '065cc639bf32082789275372184817332a703c5fb9fee390e94f4bf0c847cd30' 
  AND token = 'CbcvQ/jJunF3qGrK1l8J5nRWZEpT4f3eWzXNB/5MDDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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