Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec2816b22a3ec93e8e48269e9c44deb19ab6e165c5b30bfa7b054885e4bbaad' 
  AND token = 'tDJYiK/nNqdkSY38c9zez6mHnPc+4naQuXy/jk9jMrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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