Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b5c54a51ad6309ce41c3f7af9e550b061acf9d44c6df26f52fff07ca8dc402' 
  AND token = '85D//kUJCXXlg9E4qpvOsmOj4K987SUeR7fS+pMCmTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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