Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3526364c67ce21315005f263165e720699182d61cbceb5af34edb44dfd345f2e' 
  AND token = 'Xb+6MQtmoedr66x/4A/d7h9R4SoQ2mb9AzokhcGWoTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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