Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2740726fcc8334c3e2a919f07da72ceca1b4ed4492ada21836c17c3fddb423' 
  AND token = '1T25lLKH8lPPTVGt+IEKtBiW/qe2LmgI9YntgadMnfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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