Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926cbcc016e793546ac7d1fe539d4ad36474e51c38b3b7c65044413c9d7bf7e5' 
  AND token = '1bFAmHLe2YEdRRx5VYOyoJbmOqLIZU/RkTlEV17bUTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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