Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9c9ddabe3b9ce23e2fca0628c3794011e2198010cc83cca1abe2668eaf9ceb' 
  AND token = 'C6vVRLhanRKmxzKvTW9mtQ8w8FwpUe4sLrNVMfStrw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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