Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af9193db304b041cbd0417eb1dfba17e4963bee181e049ce6f47dd1ec1ae534' 
  AND token = '7Thx9LJ1d3BtwGH2CtRTvK6WlUD3VHlniRW1cqjX7/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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