Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021b898744596b8bffa23a374216b0655329a69a153f83633afa513ca370bbf9' 
  AND token = '2Z2yYSFEsNz3ph5nNP2Gz+ecoEheD+YXvv3LJfUb/Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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