SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2cb2d2b175a7c9f4458d7a1c0374648f97243f06c3bce5bd9ef522af1c3055c0' 
  AND token = 'Ke4fIdjJucBBueCmq+8IFInAJf2DaYS1mThTOWUCuwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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