Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2843a98cc37fe982258f9a8d8f788f60440e96da8d78d943ef2eb257b00670ca' 
  AND token = 'DJ5rRklJKNJsLMTlcmUy1TlgHiBnXeRnXSN8xExv/J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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