Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0e680bdcdd3770d6d5235feb6b7d41f62fcfda08368d5ef231be7cc46bd906' 
  AND token = 'HkMZJPK+RdhghWD6x0jevIfo6RXPA0xyt4sEtNeoZH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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