Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4336d93f11e2b5b9fd6bf5d76cde82cf6750705c85d7c55a6b2c9c454c18b9' 
  AND token = 'QQCNCCP/jhcHNRIFs0fDPDlT7rMXr3lhI9Sa8lLRl4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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