Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8457346642c387f85f9e837222c0c2af11e02356594a5cbb77100d703291d3ac' 
  AND token = 'jIAVUjc59Qb8tajTMZcMNAdquaMv69JZOpw7DPu2jfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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