Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b976f222ef1df6207c39ef2da1bdd89e9d6b4dd978b33a4f36d562584b58e90a' 
  AND token = 'HfbCHC/m8xqeP+sPCSAEaLxdcg0qYEQnRDUXkd9Ms+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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