Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '09e9d155ae9484ee711f868b2b4f6075d9c1a0f46f866cdc8a989db17996b8ff' 
  AND token = 'YkX8IauiFnQYJ5LGWOUrSK9AYx5qHvcMD6agT3qGOA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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