Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e7bfd1966cfd02843f7fe7bebf6fd18b95d19664543e5409dc965d4913e55c86' 
  AND token = '/uY5TwDwcqJMu9LiawBpiTnRv/O/1qCqORu8vl/i3Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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