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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '47a2a57940022b1a892dcd5c9f85ae1460567de6bdc4c654a32f9125ed4f1493' 
  AND token = '2J3MrwZxx8aPIG5+CGYcaClN9caIpJob5WLRnDvYMyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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