Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27a6feae02315d35933676a210f34410eb003e156c7bdecd84d2fdfbc5deb55' 
  AND token = 'g7DjvLdpXO66BhW7bqr/H5rsRk+OEitIj3sIUpLoOpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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