SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d1865b3737ce43ae1b28c6b9ce097ed5e16927cd3958949067c34bc94e18ef7' 
  AND token = 'QXFUggOEku/BmFtnPXlbUYkvBBbG9atlW/6xTrl2RVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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