Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67333d7cac6a357d3dcee0d0a17e768ce8fee35d0c5a2a15677cf41002646a1' 
  AND token = 'DbnBorsVcwmDvdURqSxAnDlh8Ldyyi9KXBO4YZbM4gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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