Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335f3558f72715574823a5327d9b14cddb358a2ce3b1a8195be99b9b5d5710da' 
  AND token = 'R75tGzswO6dM50gqltDafaAwsMpXBzdcrsMd6aZZQ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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