Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471ee1a9472438a1449d71f152a725a482cef953821b57d3364d54478695cee0' 
  AND token = 'wPkS7eR0ME+C7QvstfRmjzy3LwEML5O5eEkqIoQeBZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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