Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a7631b35ce0446a2d802119c29a89822bd944d99f9298966f4b92996d539acc0' 
  AND token = 'jlveWU2v8PxbmkOStingdQgtL5Xa/AAqPYxx8w0iRuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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