Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9cca1f67515d66d91ed508098e7b6507d4eb9fefb20962356c8a0c2062785ab7' 
  AND token = 'LJUFtuwo9imql7o0oLgpwd7CL5WlMFmEFnPT5Noyt2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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