Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20603e25b81f322f884b33becc445c3c604bdd2671a8d493dfccadf4799ae196' 
  AND token = 'Ro+HjhKpIvR5Hn+RxbKMNjyRYIf3xcjZCNP5nD0DL8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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