SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8c0301ff8e5e3c3314bcafd75978cf9d0e9ec171d90399d1f523a83ba7984661' 
  AND token = 'L0qqPrElErsQtV2/zGFShP7Y84jmqwoAiC/blEn3Q0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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