Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a0416ae989bea21f89e9fed1d93b18cc07c206fc9782d4fcd7ab6bbe81a77b' 
  AND token = 'pxG4IeE4M32lZvg0C1TewtzUULeqDw6Cbqy3yiUm6n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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