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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '835e3963702bee9083f523b8b2a284a14d425eeb7b2589fefb73e8fe76f73193' 
  AND token = 'gvPc3t/K0dKPZ/ipEdPBtWh9Y06MnpNTSkivL770A1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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