Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ccbf5338db46b65678f42d18484dad8c83bc1a98342ea65a8e0eb262e6a724d' 
  AND token = 'lVhrgOQBlfYhdFkNNdMOO5fUmwNHo6uPo0bJg1p1PD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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