Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7952d1475a8b529952ac36d797c50c69dcea013f1a64830f4bb347dec147e274' 
  AND token = '9HTu4ZQCZFgUS/nIQLT7HHAG9mNadMoADT6sPe5PDPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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