Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cefa96ae602aefacb56d1d9fc84cbc923118eebb59bcf8002ce530b2a19fbe2' 
  AND token = '6py1K6uUBazZH0lbpHgc0CwKhZpOyNOTA74KP1/ZGE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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