Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b780f8a62ee416ea530754bd09c615c52e1c817154f3bc37dda72aead6bd65' 
  AND token = 'bWgbmGgtxL69G8lnIOoIia4+MK4e/+DstXGgEBywVtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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