SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f28ac9b17f043977c3593f5bad4a707f1ba5f803168f58c6813e0b58e526041f' 
  AND token = '8VzNWFPZDhyKX7FUakt1EeelnhdURcfxrGM2Jtjzb/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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