Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4939a24da7b31949ee2ee87cb261e5c7ddac7b3a7974f4fcde3e6355ebfada91' 
  AND token = 'unA8/LW1/S6IDkWqt0vLCSjLhcz5kgpCpiIx6PplE44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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