Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc4ad21a52d4955175e7d712a44a77ae2981b5ad7315ebe7b78bcc04e8b57c8' 
  AND token = 'LsXfqRmjV/4RZ8FdDVueRr53YoCiDR8i8yfIuq0qQfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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