Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76145de26b6866a1405aaf5993cf315b36408d5d8ba5546ff8f962d417083a2a' 
  AND token = 'vekNcdHxqq2QxJFsY8XaOjFVJQ+hed0Q4UvQgM95Mmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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