SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bd1f3422397f156439e9920ad39468197ef5b3bb18c3f3b08a85dc8da1023e2d' 
  AND token = '0mdxW8yOUrZcRL6vvSS+RJA2aJ9LBslQXuTLzyF1zuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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