Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b3b9f5165a4101dfd15ced6c58d09c795212344e14ab885eb57390821b942a' 
  AND token = 'xnskcMyc1teD33akttRDhK/2uDhDpmsA5mcIIDy8mTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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