Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4559d62dd5d45a66def9c9fc0eb713b0352aade10126193cf0a281c8d781c910' 
  AND token = '91229sK3l/FcSLm3SVX7ELcCDQws8z7QFejD6yTMq0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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