Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7fe54853267280f3dd3cc3dd212d985d0f3dd6cf719efd907702434bf5714c' 
  AND token = '2OFOgTJGRw4H1BdBPQRZPiNW4u6tp3eQZCbLOrD/4xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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