Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6eb754210f990617607f390b3481a9669f6a683906593baae4d0c985e7f60cc' 
  AND token = 'NuXTr/sUJobNXvs5ArnUTXcOlW1AUEvuREgLxTxHHek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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