Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfe7ce9f81e4c581dea01c51cb1fee6398a9d9911213831adb070d6251c4ee9' 
  AND token = 'foSOytLdJMzOY/tm50VqPNngbswOYQODBrI056iLJ5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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