Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57cbe76cb0b53e5caff2252a632b05a8aff46b4a5f3f4c146801742ba5cc9573' 
  AND token = 'gxGvvRwisG0l1Sx5uTIoTKkTNc7Lx6Mgpi8mwZVmrYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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