Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bb3861e6dd9cba059e289cee17d3fbf1abbd175b65726ec2c03f47a944ef5b' 
  AND token = 'IFv5e6sy0Ew3ZAeL5f5yVeXSo5v7DUEjdZeU3QfBIGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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