Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3485f9d6f9f537adb170f335a121d68dc0c7d59d71a5330e5e93bbcffdfd0fe8' 
  AND token = 'DDQ5YMjjLafHefhu+YcbEjyQ4yOOgEaXfmyEdmn4jTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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