Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db33b8a5ee5e72752f788eb7b674fe53e84ced9c438bf753261c4d63f919fc2' 
  AND token = '6q9paZMGDnyxpD2BmVQ3fSbwAaxNqEieg5Qs/8fWQQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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