Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd31e831edac9afd03394b63a0bfb5758d3797b8212bc06a82a0ebb892f4e45' 
  AND token = 'rKUZr2FEx0ggh+CMo81GRUaonxAnwfwFVyOrlZZegtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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