Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b0570eb993f9d59e95425a2cd7224e4974a6f5db4f529b0759992c5f9c3584' 
  AND token = 'enpqvqB24hCepB/068Vwd+YnqEq/uD23B2f4epEBujQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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