Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1b6bb773080e682f0985eac9c39b114f76c655fd75cc583eeae816d4881f3824' 
  AND token = 'NOShAus/9enLHXQHmHAkExOqW5150tTKRYfzXn/4P04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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