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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '39d4aad2c31607f0592782458b8750b65e978901bf60f671675636b89b306cfa' 
  AND token = 'IWaiZDxrTPBj9Qj4C0xHXKQ0llFlbEaLRuriduS5OZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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