Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec7b9e533e86afd2985c0c52dd60c73492dde0dcfb8eca33879dcf4fb88374c' 
  AND token = 'NXe4Q3XRAWfwDiHp54sm0FDjb5JM2xkuLS1nak3VOJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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