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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0803a9c0248564db8070e9678c56db09e09fa7a173741a5318e86d4f1e01046c' 
  AND token = 'nYiIbI/DSyTw7XfsrGrvIGfiQ+9IAcPpPSTXHlnCsRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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