Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68503c3976d9ce376aa174860dcebe7e01fc7fe9812dd5275dacd95bc4f4fc5a' 
  AND token = 'cWL+XdGpzfIW/YxXFaH12tIQ9URKVngidEtCpcQ62iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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