Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bc9cfd006d25a8d270bc4f5f94c2f95550ca493d106a2e422a168270132bf8' 
  AND token = 'XTpxRybtITk/ViEvybOR1dab1nfb+zCScxwL/wC+Y9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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