Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64e3ee347f0c8dfa953956cba16e4ac3e8a02006a4e7e70d7306134bd08c688' 
  AND token = 'dKC3WsCDkxs9ywLJx5QBxVwxJfAZVx9gNlMC8K7kH5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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