Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d803cc609ca29e5fa169e105443931ab82fb6e536cac25a823bcbbe2c5d1e92' 
  AND token = 'mrGPw0ws8pPQpUk4WWsQQdYcxLVcT4gCNjBvm5P3idw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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