Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d663971a5b849a33c226dec42bb98822c45fd6bc19622c1ae02d31fb65cf1ea' 
  AND token = '+qNyZvO8WdfSFLaTKCa6uGUKHk9ao8bCSZsPyno+UCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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