Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776f8d805d3f4f1c58e9292b52ce4c59636fcc2d337b7bbabb4bbde54ed058eb' 
  AND token = 'vKQQjhPxJqzOFcbb8nWpAbiF6KN6/8opf9rg1+p2xzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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