Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfd3fd77a4c1125784655296036718a157cad02cf1679aff347641fa36110c8' 
  AND token = 'xqmU1vgIfHepzXAb5VFPGeKt4wS5XEC/Ip6PXnk4Ge8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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