Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1772d87769be61667af79a5ab9e48c8a5909affd8ca7f14ae2e3aabe3da9682' 
  AND token = 'L5nhGpCbO9VJiZ+AXjpx7Zr4pxEQVob7q9A+Un8p2n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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