Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6fadb97bb113be6bbccf7c24bdb22af6cea84b47db78d4d8d6ec41dc501dd7' 
  AND token = 'UtiSpWT8lpGn7eqsFmYFCF7EwewLSQbLKy9Ldmf1hGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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