Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a529d9fc8b8cf45ba903df88c096f6579b9a67cefadfadcee3fa665937fa770c' 
  AND token = 'HpiRPKJNOPCMLLRoOa1NkPTL9IsyT1tuwK2LHhBl62Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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