Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1359c5a5c4e491db38ff2bd74f11709eecaff1790d7e1605c3d66478a2613a9f' 
  AND token = 'UPLTNNyOkfPFxRsfzO91HXP+tSLK8D+dH47b5hTonNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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