Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735ae67885a3081e62a7ec520a7da75264a7583c91122476c41e5a09ce16f053' 
  AND token = 'DuS3KjimW8aA3H20710h6UIkt1tu1huQsqoNkvKIVI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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