Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6822fd844e192a74a8d0eae05827889d3ca83427a7d4e0ece11d331c91842070' 
  AND token = '+8i8FcZS3QWPzc7KhrycyR+azBrxti+c6x1ftQNTTIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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