Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52bffcbe8277e0522aea813ca21fe18335917594724a6682e8b5741f21fddd3' 
  AND token = 'V+cUAoJ9sI8ajKnkF6oiLhHMZaoIGhWIK011ltAeVrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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