Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31c78ea58130eafc3f67c1db93835a4938a50e8c4918a93f8e3c493635797a8' 
  AND token = 'B+CG32rorfRxbPnTc7Q9IFudIDaDkGBJ7WKbMBCIdKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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