Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106b0b8b35c54868f84e953784259ec35f5f9abaaf57c5184e504d1bea6ea76d' 
  AND token = 'QQ8XDdvIyWHxdrFhXOliJHQHp6NcVKYhR0ktV7Q/AEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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