Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e2f4d408ddc6cc26f5a9383d7f58d3dd2bfb45def375f10bc964caeb59e2d1' 
  AND token = 'MIkVWx4CaQwC53nsiEc6ZTnyYzQwXEL1gWiB7fRKMKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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