Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c126a52239ae345a7147d3706c89e69a6b2562e0d111aebef41fa74f8f8e6d' 
  AND token = 'FsbJzF/obXSqwA+s2ddLVh1j4ioaWxwRP0AnxHrj05U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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