Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9140ddc5f545241288753348f704a5fa71f18212d36098b189489f4416ca96' 
  AND token = 'IHDdgfWxYPA1mUN5RTeOxIB0BNNyWKueLo6qYNZSv3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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