Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546474602bc234c74c268606e584b49de1871afe6c01b141f58b6a3cdd02ec8c' 
  AND token = 'XYlwUYyTPwE7lcn9AuwMBPrLBxGL/kNgNAjSRd54IkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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