Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200ad6e6df98ed26766733298f91f39061e84c12e7b6a44aeb1233f9bd12b2d5' 
  AND token = '+Cx43wTvO+f6iD8rdxTYqk3/e/yeTAjdNKh+QJ/gCOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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