SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '164504ee5c98461805b9440dff0315cc28540d31b030760f0031a262720b677e' 
  AND token = 'tz2b/OYq2UZkbXGiUI8hC4U6liaZTJxOMZ+jc5dGvsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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