SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '223647ad66adada3228e6198486bbcb703ca4219c69dd1b54b171b5d814586e2' 
  AND token = 'w/fSBpjt+S825jv1Q640DYVzCSQHpEYD34PxOd+RVm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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