SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e22668514a401823b56ffe6096913665eb8c64269557b8324efaa8330fcef3af' 
  AND token = 'iZH9+DTOyOX2Lk9VYB7YnTl03VxtAeZlD6ZGFNhOlxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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