Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1f11eca4dde12c09d789c72f82dd899dd6a03a83f65b6f45248df6d2fd866b' 
  AND token = '5SlxYwl5zHtqNVD5Taoisl1k4Jx2YmZ3oj6JFC/Z01Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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