Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcd8ae84ac6941033a0b0001f0df3ef2106ae2a26e1f4a21dd19e9ec0c2ab72' 
  AND token = 'PaYcEJYuuCSxANMYbbJ7VsWWbOyZsxS/GVTl5101Y3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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