Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964cd99e0618f0717e4ebf3a9539a70d41264ef0651a123c2c0c418faed92d5a' 
  AND token = 'x+9HJZ2SFAdHDEmnJ8E0ihoUFzoQ2OqV8kKwGJUxxyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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