Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d9028bcf72bcb62779464875d1bb6911a99b3b5b4db584df8a6154e0299b52' 
  AND token = 'GuaLpi/c1ebHKAwl40KvZqw012IYg7tIS7c2QXZlCGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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