Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27bc150eeac7decb568ed8c4ed606cc5cd88479fc2091ba21fcfbb234991ef66' 
  AND token = 't9bHQ3ctmR6iP8qzxF0L3TP8S9B4j9Xl68I/GI4A8jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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