Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad46663737dbeb09c0de94bbf9a6cd7d3270ea39e54b6b737fb6eb7b0d2f504' 
  AND token = '5sMgaljqpkwC6Zbjghi4XdKm+3hd+MyabJxjxCUUJ7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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