Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5a45c1861947a6dbe815d8da2c0888fd66861ccfa66d57d4b7e9d1aade0d64' 
  AND token = 'ylI756/qXeVAtfT9JFO+oO9qDbCEWcfxhP3TNXKhcQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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