Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6456e06e365a89cbae02a0c79d9ee1a6fcebcf42df708063ab53218505df09e4' 
  AND token = 'mzglD58AqAeSSh+6GCVs0FdnRimCl1FZcIn2Zdyye+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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