Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd878af968ef9aab7e885fa33f3e194b7b6067d01e83210ec8bb73fbb24e4536d' 
  AND token = 'G7CbRO6C+i6cAaYKf1HU0VbC0pd9fLhuzxO3cj0r9e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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