Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0fd720f75781c56e1b04e76cc391ec6181e631110e733b9eca7d1558612649ab' 
  AND token = 'ObrxsNw/O1RacHfvYhe0U+6sFnYhr6l+IXYjMZvwFqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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