Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57879fb4e1e6cd7e488920dffd6ff6d0d5a82d42dea4d782909bb873d9571b86' 
  AND token = 'DQCzn7KJrPQZo54fZgnWNc3bt0pKoDP8xYS4VlKfWOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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