Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8038413e727c59c6c244085baaebbaec7597346ea47870da69555f9920b97f68' 
  AND token = 'NC++8NmewjVcWl2kR9pcAGnHgwTYttUbsIsUz9Bwj7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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