Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d8380359df78a383e9469356f08fa9a28db9900f5fbe8ad04b5fc63dbf08f3' 
  AND token = 'DK/C07UA4lcJ/tCY3mjuTQFyA4Opk6+gUWeqACaHBqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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