Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfabdf424c4ade5cbca24241dc79eeeade4eeeefae4fee6dd049ce292b295658' 
  AND token = 'PU3fboUd8XdtPlLzXO3oF3mrFJKJOYb51XJIcqKPlmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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