Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7d7cfd4f66bb282e8157fd774c5a6211aaed6acf4d76e4c9f57479672e64e7' 
  AND token = 'FoL7EuJDHDJjhL6qzYDL6FlPKxJL2k9ZBM8jEQ8KQRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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