Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2616a56c7dbeaf2a726a262a92873a051b3f0069dde5c0616d300cd38ddbf6b' 
  AND token = 'qxHXWmghxvV583R/tVYQHvO5ZEF3OXY88Spb1qYm9no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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