Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8b0c3c913b04c144c7a14e38f528f8abe45e11729c4c791d39553bc0e8704f' 
  AND token = 'mRyx99GzsENzCDzI+9sVHow3xivzqE+Bxw7aHQFf6SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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