Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d5a950d8fbc31e0a9fb9f6569d38b584f416f1dc4574a3111002b5ae09cf4f' 
  AND token = 'ZAwSt0HBtiCIMfLTD57nERVv6OGJhcq+sTDnSyifXxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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