Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e96ba77832b336e168e288663769178cdf09be75ad782cc63d86f32e5e6cca' 
  AND token = 'b+cLFDq/roGHNHhLWRSh9qEpldVc8pUFdmgRACCLmdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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