Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0dac5c5215370f9e2cfb522b857b929f4761c460e6bce56e772b8572cf06be2' 
  AND token = 'JIPeI+TsMJ4UQ9JQcL/mVyvkIuLGY2uX0g+eF/Ajzf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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