Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257c5b85b35b7c8c1eeaae7071c42bbbad638612be271d7b8d9f92d4aaea9c39' 
  AND token = '69Zx1McLzWDhX9DTzcKpPKT1WWPDgmO0MEt+peHwgkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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