Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52cae81452c332e27d3b4bdb844c814941748bded373f6255119671ce4a8768d' 
  AND token = 'XMxlPr9LdWahlrPc8eqxaLyjYwa/2DxjprlWPRIEYqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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