Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a62e86e30816d660fb355c1458037ff644a6de9e2d663449876d09377851a5e' 
  AND token = 'itYKex2RewMOa0kmDrctiiV46GbKocMuE9fMmVpVKmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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