Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b035502dbbf89c37942c96c1fd742e22e5dcb211d5e3d3930b12c2be705df700' 
  AND token = 'aw/tnyoCoZiz8+DWudVxUeIl4Ym69JFRiBQTREJ5aL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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