Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f04a8aaa68edb497f7728df39d430a8cebbb3b54deff70a4d6d8703b9b9aef' 
  AND token = '/U2pUGiRi1plYDd7SWzFkqCRf14U5RQAgWgI1jyLzww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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