Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75bd4906869742a1ff35f929f7d20c4e76c047caca99979b30f0c00da7721fec' 
  AND token = 'bkdxi27dS8ySKNwRjFnbIhuq5QprwDclt0C7P0NLhHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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