Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a9a382a621cff5df8ce379d5385f8c84d4d3839c0dc6d680d77868ee7b4f7c' 
  AND token = 'bJBpvBKkzlVvRtD07W4VV5ZqZKmw2tkXXaFUfEw4Z84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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