Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8e83f2f9fceb6cbeae1f71e15ef612d3cd139743147b92f4265b84dc7361c3' 
  AND token = 'H7FMkr6NHkNr2KUwv0EIYwJcLXq8kCHhWcfSmwtlL84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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