Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd3f05ea3ec156a19b10b6fc6ee7bfe178fa266b18a1cabf12013e77b3ef6e0' 
  AND token = 'ISMOCgaEIA1Dednl6xZBXWtOPzghGm2UQVxmVpbcCAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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