Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933cb01cfe2f15e3cffeff2a83f8d73a15c314f0fb673693beec55a7b3e52767' 
  AND token = 'RFvt+728Xcp0vM8j41lJR+PtKgKhmzAWQ+vLQtLyCMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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