Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8b9dbd5e6a40450c1b272872fa4829f5a67f3014dc3d9501cff016513bac3a' 
  AND token = 'qUn7ClPIQyxfvK3kxUU9REPAh1vwpU95gppdIjASQEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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