Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3421012c3c61ba39cd5acbb1da969307faa3cafef68ef6969da50772bde4a4b8' 
  AND token = '0vDqPic9b29GjiDZp6nmxIZnxVCSngf7J73ueftvpKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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