Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a7664f69899ffdf81d9d337a84eadf995baf365da7c93db6e7ab39a5b863c6' 
  AND token = 'Jy9ehBwOfpb0lZfuD44k5avf1NO+zMMYVZ1aRDVBIjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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