Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe53e9ddb350b9969ebc02571e5acb88f0fd00f9a70b019cb088c711ecd1066' 
  AND token = 'uO/C6M4mfmfEBIaPQ0v2cFggQHVVw+kSwfhdD8kMk3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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