Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85693a3b141d3d05be56b4ee9433baf7f1e73330d8043c6c53839a5e34f755c' 
  AND token = 'X6IlaaG7cGGtHiiRu/QDsyUPe5iaLK51s1pUfwMuz3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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