Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f58ceccb7c77919626d26594126eaec276b26f6aef40746cccf8b956235d84c' 
  AND token = 'oV6DuGAw2ZZAFmWGLPRZ6VOUdKtufBEUoDYsCD56sOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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