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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0bfc63d5628463e8edb6eec34ca7d9409f23e4a3f7b3d79e436c11ca3972d28f' 
  AND token = 'kPVa4RRgigo6XFX/WcQfKiLQbaDm9TunTEqy/9uVIYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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