Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b09adf8fae900a0504e5584879a1cd0d580448a7c9bdf751c30e358742e30b3' 
  AND token = '8ju1QBxNpnQrnErP2eAaaZtTXSW3rAcJWEFbSv5QqAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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