Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d88faeffa2724bcb75a44b280748025aa259b4ed5edb6e6235b4c2c9e3b11a' 
  AND token = 'vC7Y5FxOeUf5iX11nZ+NxfGqFNmrFW4APBzdTRTGdEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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