Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76323f23edb7f45c009c3ef172ed9efbc1aab4c269ad57fec850b27a517fd376' 
  AND token = 'WbgSL9MgxZ5WiZu+aUfGYmAxvdou2ekuaw0xBkXK1n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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