Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66e4ce41eaa7f88de9d6867aac60841848d33e972b507f6d91a22e622b6517e' 
  AND token = 'X9cgHqpEJLZ48OzAPa+ckLfdo4Bc+0nM0l4ogbfmDfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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