Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44139302c4c42d14c62202225468c4a6c989a927fae9af39fcc76541abe68353' 
  AND token = 'ZGokW6sExqc384H5qpHv9rRQGObfA59qJt5x/pO8Lu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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