Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d024bb51cbb4fae36b553e18c03454547a32a1bae9d2bf170f510cfaf1ab7b' 
  AND token = '5rvb8zi+NLi1oci7LcVV1WY6GDQvjpmxBEUswQo8xb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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