Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5f1240d3161d9521394152154111d4adfaf68ac30ed94a95dd186e896bae85' 
  AND token = 'SmUBrlz412FKFl3e+TVlW9H0HFOwqPHWLHLjIL+//6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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