Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8963e132c4cf100de733e320834e443579c4061b2e18c00f671e9320fae62ae0' 
  AND token = '+q63zd86E9l/7aqP67hiDCXjvnnKbQlzv1lvDQ/KkBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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