Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9115b4fe5c1ca461308507d90b9aee418d2ea3dcb35a7e2a3094571f4ce8b3' 
  AND token = 'XcAwH7InvQF9gvXaqSV0555WCLtwgrNM0aw1i6fcDxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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