Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ffc12a1a37673540b750845af360b856a17eae42fa54f2dd93a4077d2730264' 
  AND token = 'KzSUXtF/f1rYw5Vr8Bbv4Ayc0cEjnYE2NeB2tUraQ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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