Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f4014bcb70c70fb71852f10012ef6a93cf9e39eee7b53eb481a64c3f6d7b79' 
  AND token = 'LUry72bZN1JqPn4Oh7NohqqV6CYHRh/6BBb/wmdx5OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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