SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '61f864327fa3a5b0fc17055361521047fef0b94f4ce8f382bc8c04c52564f46c' 
  AND token = 'vX2co9mvb0sOdGvEMXqliKHZwwiD6poVyUtTtl8Pngg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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