Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61791753a6fa4740960cd74a4cb1abc2c393cf1512eb5fef21a72deaa1b6bc52' 
  AND token = 'AD+jU/SzQtxz+PY9GIHN0dRnmBXrzQuoFd6+SKmXXSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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