Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3879ff7e0ecbd638fa5b8a0ac58bbbe4d732c67c0d607b7fa941bfcbfb2cab' 
  AND token = 'f03BgMQ7pHPY0Lj6qqELZP7ncfn0zaqPnHla4UyYTxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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