Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2809c66c8d043b2cf15ccaf1d7268e4a8681cf5a9dea4c581455d6c480aa3a73' 
  AND token = 'L+GhotTyx1xKqanF0eOixyBnUyCyqr2PG4WAjbp8TDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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