Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8761f96baca29f71bfa74e71f9385ecbfe972c8114cf06d21eb7548bd427b5e2' 
  AND token = 'Lg/wMIfZJQ09WkUoLwmRcXJ98mnFu9j1I7Q+CNfPrvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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