Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5feb9bea484556eb735d78aeb5700d7dad21bc436a04c0ca3da8e84e0ee4f98e' 
  AND token = 'L3FKRtBcGfMn3RdRz0pihkaZs1yNlQPuSt5p0AjEWRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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