Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8d3ebffa8dc40375b2ccfaec7bec3727521f7dcaa98d82358bdaf55da9b6aa' 
  AND token = 'WZgoYkYmj/qTdIAvNZfJ4exUQrMHcRRBJpLdL0c6XyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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