Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dfa36d0c007ed57b82d1a7275b5c7935e16b92c8acb578c68f3bea0dc84900' 
  AND token = 'MZsxlum0o2P1W9ldcgNiBzLVPTJLzC8an58myaL+r90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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