Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177dabc7ff223ec021e5d3ce4c23b8c80f0ba18931d75079eff5b213cf692035' 
  AND token = '3dVzzpoF/rmkO9sGRRRpAnJO9OTBMghUOxqpfM29uGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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