Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2031e6fe9ec6e381799b239f1444fd87fcb18ec621722535c0087da1ed5df693' 
  AND token = 'uJ8KLG6ciDiTYsocqPHmHC1t9+7dAMFbQARaAb6792U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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