Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402ce86a61c32919110faa469d50bd42d0cfe6b354cf024ae4f8d1df90deb012' 
  AND token = '38vJ/1Z5ftbPQTOF6r31wqbdjZ6ORKo8/42jaK9IPKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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