Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87a02d8c4b0293ab6fcbbcaed8c7ac01caf7ea3226b29c3b7c06759455e7e76' 
  AND token = 'nRq3DVL6gTO/t1glA44wZmyqZ+uqJdNDgIiPDDY1mRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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