Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6df73dbca422d8fa9aa9d11f38e2eea83e57790385c2ccfe829063937f8229e' 
  AND token = '51QrjJ5fU96YlTFUHy9SlZpugYz/r80k0mmx9pIuH5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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