SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8a537c9e9ad6d361adb5d844e1c72bf19794b3ced43144454fbad6c8057fc8e4' 
  AND token = 'XBxqaKJO6x2zyDjVKO5I1WAHGBnI+SeYvGjsl0RAFcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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