Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47418b6800d41ed7fec3113ddfef6952f26daa5cd6af9a1700dbc1fda79c43a' 
  AND token = 'u7BTEeOW/XcfDEU+WXRWIp98/aY+9oqhmzjYgZBOPEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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