Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46843d27c9d124c0860556368ca7990f511db729cc8c0fa00c45d59c5a260ce6' 
  AND token = 'Jz8QFBrP6111/JYrWt71oGdEoXjkXFom7ZwIkkPGgg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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